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The effects of dietary protein concentration on feeding and growth of small Lytechinus variegatus (Echinodermata: Echinoidea)

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Abstract

Understanding the nutritional requirements of Lytechinus variegatus is essential to define its role in the marine environment and necessary for successful culture of this species. Protein is an essential component for growth, yet the requirements for protein in most marine organisms are not known. Small Lytechinus variegatus (ca. 14 mm diameter, n=160) were collected at St. Joseph Bay, Florida in March 2000. They were held in aquaria and fed ad libitum one of four diets varying in protein concentration (9, 15, 21, or 33% dry weight) for 14 weeks. Diets ≥21% dry weight protein were sufficient for maximal growth and survivorship. Individuals fed a diet low in protein compensated by consuming higher quantities of food per gram wet weight. However, the protein was insufficient to support maximal growth and survivorship. Total dry matter absorption, protein absorption, and carbohydrate absorption of the prepared feeds were higher than reported for natural diets. Total production and production efficiency was lowest in those fed the low-protein diet. Gonad production occurred in individuals with test diameters smaller than reported previously in field populations and was lowest in those fed the low-protein diet. The acini of both females and males were predominantly composed of nutritive phagocytes, suggesting that growing L. variegatus use the gonad primarily as a nutrient storage organ and not for reproduction. In females the growth rate of oocytes increased with dietary protein. In males, protein concentration ≥21% resulted in an increase in the volume of germinal epithelium and a decrease in the volume of nutritive phagocytes. The minimal requirement for protein in L. variegatus from approximately 1 g to 15 g total weight is >15% dry weight for the conditions of this experiment. The requirement for a diet >15% protein corroborates with field studies that indicate L. variegatus consumes epibionts and animal tissues preferentially to seagrass, and that the microbial, microfloral, and microfaunal community living on the seagrass may provide the extra protein required for growth and survival of small L. variegatus.

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Acknowledgements

The authors would like to thank Dr. Mickie Powell, Scott Hofer, Adele Cunningham, Victoria Gibbs, Rebecca Worrell, and Janna Owens for technical assistance and animal care. This research was supported by the Mississippi–Alabama Sea Grant Consortium, grant number NA86RG0039, and the Alabama Academy of Science. This research was approved by the Animal Resource Program (011103710) at the University of Alabama at Birmingham.

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Correspondence to S. A. Watts.

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Communicated by P.W. Sammarco, Chauvin

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Hammer, B.W., Hammer, H.S., Watts, S.A. et al. The effects of dietary protein concentration on feeding and growth of small Lytechinus variegatus (Echinodermata: Echinoidea). Marine Biology 145, 1143–1157 (2004). https://doi.org/10.1007/s00227-004-1391-x

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